School bus passes through an intersection with traffic lights in the morning on his way to school in the afternoon on its way home the two way frequency table below shows the number of green yellow and red lights at the intersection in a school year

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth